Following the 2-0 grudge-match win over Walsall Alan Pardew told BBC Radio Berkshire: "Our search for defensive cover is on-going. With the possibility of the transfer window closing for us next week we may have to get a move on.
"I am considering either a loan or permanent signing."
Earlier this week the Royals had looked set to sign Colin Hendry but the move fell through when the ex-Scotland international failed to agree personal terms with the club.
With Adi Viveash looking all set for departure in order to get first-team football Reading have no cover for the Williams and Mackie defensive combination as both Adie Whitbread and Ricky Newman are suffering from long-term injuries.